Looking for Jailbreak Tweak

Hey Guys!
I'm looking for a tweak (or app or whatever) that shows the nicknames I set for people in my texts instead of their normal names in my contacts. To clarify, I still want to keep their full names, just be able to add nicknames and have them show up instead in Imessage. I need this to work for IOS 7. Thanks in Advance for your help!
Sam